Dust-collector for rock-drills.



E. P. GALLIGAN. DUST COLLECTOR FOR ROCK DRILLS. I APPLIOKTION FILED NOV. 21, 1912. RENEWED MAY 7, 1914. 1 1 28,437.

Patented Feb. 16, 1915.

2 SHEETS-SHEET 1.

whines gee E. F. GALLIGAN.

DUST COLLECTOR FOR ROCK DRILLS.

APPLICATION FILED NOV. 21, 1912. RENEWED MM, 1914.

1,128,437, Patented Feb. 16, 1915.

2 SHEETS-SHEET 2.

if cm x @1 1 THE NORRIS PETERS CO, PHOTG-LITHQ, WASHINGTON, D. C.

irnn s wrns PATENT onnion.

EMMET F. GALLIGAN, OF IDAHO SPRINGS, COLORADO, ASSIGNOR 0F ONE-HALF TO 'HENIFEZ'v E. WOODWARD, OF DENVER, COLORADO, AND ONE-FOURTH TO WILLIAM H. GALLIGAN, OF IDAHO SPRINGS, COLORADO.

DUST-COLLECTOR FOR ROCK-DRILLS.

Specification of Letters Patent.

Patented Feb. 16, 1915.

Application filed November 21, 1912, Serial No. 732,650. Renewed May 7, 1914. Serial No. 837,070.

To all whom it may concern Be it known that I, EMMET F. GALLIGAN, a citizen of the United States, residing at Idaho Springs, county of Clear Creek, and State of Colorado, have invented certain new and useful Improvements in Dust-Collectors for Rock-Drills; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in dustcollectors for rock drills, my present invention being of the same general character as that disclosed in my application Serial No. 720,551, filed September 16, 1912.

My present invention, however, involves a number of novel features, the object of which is to make the dust collecting construction more nearly dust-tight.

The general construction of the device consists of a hood adapted to surround the drill hole and through which the drill steel passes, the hood being held in place by virtue of its connection witha yoke provided with spring arms which enter the drill hole, the said arms having sufficient tension to retain the hood in the adjusted position, the hood being connected with a spring which bears against the yoke at its outer extremity. Leading downwardly from the hood is a detachable hollow leg composed of some suitable flexible material, as canvas, whereby the dust resulting from the rock cuttings which escape from the hole are carried downwardly and deposited at the bottom of the drift or tunnel, escaping from the canvas member by virtue of the fact that the lower extremity of the latter is open.

One feature of my present improvement consists of a felt ring surrounding the extremity of the hood adjacent the breast of the rock, the said felt member normally extending beyond the hood extremity and pressing tightly against the breast of the rock to prevent the escape of dust between the hood and the said rock breast.

Another feature of improvement consists of a bushing composed of felt, or other similar or suitable packing material, which is carried by the jaws of a clamp, whichconstitutes a guide for the drill steel. This felt bushing closely engages the drill steel, the clamp being provided with two metal members, one attached to each jaw, and which conform to the general shape of the drill steel, the said metal members being arranged to engage the drill steel just beyond and below the felt bushing. 'By virtue of this construction, the clamp not only constitutes an accurate guide for the drill steel, but also prevents the escape of dust around the drill steel where it passes through the clamp. The canvas hood is so connected with the clamp that there is noopportunity for the escape of dust from the hood except around the drill steel, and this is made impossible by virtue of the fact that the felt bushing closely engages the steel, as heretofore explained. Provision is made for the adjustment of the jaws of the clamp, where by as the felt bushing wears, the jaws may be tightened to compensate for such wear,

thus maintaining the felt indust-tight contact with the drill steel until the felt bushing is practically worn out.

Still another improvement forming a part of my present invention consists in making the hollow canvas leg connected with the hood readily removable therefrom, thus making it practicable to renew the hood, which is subjected to much greater wear than the detachable leg. Hence, by virtue of this construction, it becomes practicable to use the hollow canvas leg, or conduit, with a considerable number of hoods, thus making it comparatively cheap to substitute a new hood, as the conduit member may be readily disconnected from one hood and as readily connected with a substitute hood.

Having briefly outlined my improved construction, I will proceed to describe the same in detail, reference being had to the accompanying drawing, in which is illustrated an embodiment thereof.

In'this drawing: Figure 1 is an elevation illustrating my improved dust-collector in use, the same being shown in connection with a rock drill arranged to drill an up hole, or a hole in the top wall of a drift or tunnel; Fig. 2 is a fragmentary View of the hood portion of the construction illustrated in Fig. 1, but shown on a larger scale, this view being obtained by looking in the direction of arrow 2, Fig. 1. Fig. 3 is a section taken on the line 33, Fig. 6, looking downwardly. Fig. 1 is a section taken on the .line 4-4, Fig. 6, viewed in the direction of the arrow. Fig. 5 is a section taken on the line 55, Fig. 6, looking toward the left, the drill steel, however, being shown in elevation, and broken away at both ends. Fig. 6 is a sectional view of the hood and adjacent parts of the dust collector shown on a larger scale and in connection with the drill steel, which is shown in position in a hole in the rock. Fig. 7 is a cross section taken on the line 77, Fig. 6. Fig. 8 is a detail view of one of the metal bushing guide members forming a part of the clamp surrounding the drill steel, when the parts are assembled. Fig. 9 is a view of the same looking in the direction of arrow9. Fig. 10 is a section taken on the line 1010, Fig. 8.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a drill which is vertically supported in a drift or tunnel 6, the drill steel 7 being shown in place in the hole 8 formed in the breast of the rock 9. This hole 8 and its outer extremity is surrounded by a canvas hood 10 which is provided adjacent the rock with a member 12 preferably composed of felt, which com pletely surrounds the extremity of the hood adjacent the breast of the rock, the felt member being relatively thick and extending beyond the extremity of the hood proper where the latter approaches the breast of the rock. By virtue of this construction, the felt member may be made to tightly engage the breast of the rock, while the adjacent extremity of the hood proper is located a short distance therefrom, the felt member forming a dustproof joint between the hood and the breast of the rock. This felt member is secured to the hood in any suitable manner, as by sewing, as indicated at 13 in Fig. 6. The upper extremity of the hood is secured to the uppermost convolution 14 of a spiral spring 11, the opposite extremity of the spiral spring being connected with ayoke 15 by forming coils 16 around pins 17 formed on opposite sides of the yoke. The extremity of the spring adjacent the yoke is formed into a hook, as shown at 18, and soldered or otherwise suitably secured to prevent the uncoiling of the spring. The body of the yoke 15, which is horizontally arranged, if we assume that the hood is in a vertical posi tion, is provided with two parallel spring arms 19 which extend at right angles to the plane of the yoke and enter the drill hole on opposite sides of the drill steel. Normally these arms are considerably separated, but when they are inserted in the drill hole they are caused to approach each other, whereby they are placed under tension. After they are inserted in the drill hole and the pressure which causes them to approach each other, ceases to act, their tension or normal tendency to move away from each other will cause them to engage the wall of the drill hole with sufficient force to maintain the hood in its adjusted position. The upper extremity of the hood, or that adja cent the breast of the rock when the device is in use, is bent over the uppermost convo lution of the spiral spring and drawn downwardly a short distance and'an expansion ring 20 is inserted in the mouth of the hood and serves to hold the latter in operative relation with the spiral spring.

The hood, on one side, contains an offset 21 where it is open to receive the drill steel 7. At this offset a clamp 23 is connected with the hood and extends partially there into, a portion of the clamping jaws being surrounded by the hood, which, at this location, is connected and tightly secured to the clamp by means of a rubber band 2 1 which is located in a pocket 25 formed in the oilset portion of the hood, and engaging the jaws 26 of the clamp below exterior flanges 27 formed at the upper extremities of the jaws. This rubber band is threaded through the pocket double, and its extremities protrude from the opposite ends of the pocket, which are open, as shown at 28, to permit the closed extremities of the band to be caused to engage pins 29 with which the jaws are provided. The offset portion of the hood is separated, where the extremities of the rubber band protrude from the pocket, (see Fig. 4-), and is also provided on opposite sides with canvas loops 30 which are also connected with the pins 29 of the jaws, whereby when the jaws are closed and locked in the closed position, the offset portion of the canvas is drawn tightly therearound making it impossible for any dust to escape between the jaws of the clamp and the engaging extremity of the hood. Within the jaws 26 of the clamp is located a bushing 31 composed of felt, the same being divided, as shown at 32, to conform in a general way to the division between the jaws remote from the hinge pin 33 of the latter. This felt bushing is preferably reinforced on the outside by a thin layer or strap 34: of leather, which comes in direct contact with shallow cavities 35 formed in the aws interiorly and located between the metal guides 36 which conform in a general way to the shape of the drill steel, as heretofore explained. The felt bushing is of considerable thickness and is held securely in place from below by the and the steel.

The jaws of the clamp are provided with arms 38 which are caused to approach each. other during the closing of the jaws. The

felt bushing is made of such thickness that originally, or when the bushing is new, the

two handle members will be considerably separated. Hence, as the bushing wears, the jaws may be tightened by pressing the handle members toward each other, and in this manner the bushing may be utilized until it is practically worn out. In order to adjust the handle members to compensate for the wear of the felt bushing, one of the said members is provided with a sort of toothed quadrant or segmental rack 39 adapted to be engaged by a wire keeper 40 which is pivotally connected with the other handle member, as shown at 41. This keeper is adapted to engage the recesses 42 formed in the member 39 whereby the jaws are clamped in the desired position of adjustment.

Adjacent the ofiiset part 21 of the hood, the latter is tightly secured to the hinge members of the clamp, as shown at 43, and from this point merges into the adjacent side 44 of the hood which is in direct communication with the downwardly extending conduit member 45 which is connected with the body of the hood by means of hooks 46 secured to the upper portion of the conduit member 45, as shown at 47, and connected with rings 48 carried by loops 49 secured to the opposite sides of the lower portion of the hood adjacent the conduit member 45.

The clamp 25 is connected withthe spiral spring 11 by means of a chain 50 whose upper extremity is connected with a ring 51 mounted on the spring, while its lower extremity is connected with an eye 52 formed in the hinge pin 33 connecting the jaws 26 of the clamp. This chain permits of considerable variation in the distance between the lower extremity of the spring and the clamp, thus making it practicable to force the yoke 15 toward the breast of the rock without moving the clamp, since when the spring is fully extended in the direction of the axis of the drill steel, the chain will be slack. a

From the foregoing description, the use and operation of my improved dust-collector will be readily understood. The spiral spring 11, together with the yoke 15 and the attached parts, will be inserted in the larger extremity of the hood, a portion of the clamp including the handles being drawn through the opening at the ofiset 21 of the hood. The extremities of therubberba'nd 24 and the canvas loops 30 will then be ap-- plied to the pins 29 of the clamp, after which the jaws of the clamp will be closed by pressing the handles 38 toward-each other, after which the keeper 40 will be thrown into engagement with the'segmental rack or quadrant 39 whereby the felt bushing of the clamp will be held tightly around the drill steel when the latter is inserted. As soon as the hole has been drilled to' a suitable depth, the spring members 19 of the yoke are forced thereinto, whereby the dust collecting mechanism is held securely in place and the heavy felt member 12 caused to tightly engage the breast of the rock around the drill hole, for the purpose heretofore explained. Then as the drilling operation goes on, the rock cuttings will pass downwardly into the hood and thence through the conduit 45 to the bottom of the drift or tunnel where they gradually escape,

but in such a manner that no dust is produced. The guide members 36 of the clamp are secured to the respective jaws 26 by means of rivets 53.

Having thus described my invention, what I claim is:

1. In a dust collector for rock drills, the combination of a housing having one extremity adapted toengage the breast of the rock and surround the drill hole, means for maintaining the housing in such position, a clamp applied to the housing and composed of jaws between which the drill steel passes loosely, and a bushing of felt applied to the jaws and adapted to come in direct contact with the drill steel, the said jaws being provided with metallic guides conformed to the general shape of the drill steel, the said guides being located below the said bushing, substantially as described.

2. In a dust collector for rock drills, the combination of a hood having an offset portion provided with an opening, a clamp secured to the hood at the said opening, the clamp being composed of hinged jaws, a felt bushing carried by the jaws and adapt ed to directly engage the drill steel, the jaws being equipped with parts beyond the bushing engaging and conformed to the general shape of the drill steel, the jaws being adjustable to compensate for the wear of the bushing, and means for locking the jaws in any one of several positions of adjustment, substantially as described.

3. In a dust collector for rock drills, the combination of a housing, having one exclamp applied to the housing and composed of jaws between Which the drill steel passes In testimony whereof I affix my signature logsely, tge jaws beiiig equipped witlliO mein presence of two Witnesses.

ta ic ui es arran e outside 0 the ushing 215d having th e general shape of the EMMET GALLIGAN 5 drill steel, and a bushing of felt applied lVitnesses:

t0 the jaws and adapted to come in direct EMMOR J. SLATER,

contact With the drill steel. AXEL PETERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

